Global Patent Index - EP 1489605 A1

EP 1489605 A1 2004-12-22 - OPTICAL PICKUP

Title (en)

OPTICAL PICKUP

Title (de)

OPTISCHER ABNEHMER

Title (fr)

CAPTEUR OPTIQUE

Publication

EP 1489605 A1 (EN)

Application

EP 03712945 A

Priority

  • JP 0303660 W
  • JP 2002083799 A

Abstract (en)

The optical pickup of this invention includes a diffraction grating for dividing a light beam emitted from a semiconductor laser into a main beam, a precedent sub beam and a subsequent sub beam; a hologram element for dividing reflected light beams of the main beam, the precedent sub beam and the subsequent sub beam from an optical recording medium respectively into first through eighth main beams, first through eighth precedent sub beams and first through eighth subsequent sub beams; a main beam detector for receiving the first through eighth main beams; a precedent sub beam detector for receiving the first through eighth precedent sub beams; and a subsequent sub beam detector for receiving the first through eighth subsequent sub beams. <IMAGE>

IPC 1-7 (main, further and additional classification)

G11B 7/09; G11B 7/135

IPC 8 full level (invention and additional information)

G11B 7/09 (2006.01); G11B 7/12 (2006.01); G11B 7/13 (2006.01); G11B 7/135 (2006.01)

CPC (invention and additional information)

G11B 7/131 (2013.01); G11B 7/123 (2013.01); G11B 7/1353 (2013.01); G11B 7/0906 (2013.01); G11B 7/0912 (2013.01)

Citation (search report)

See references of WO 03081582A1

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR

EPO simple patent family

US 2003178548 A1 20030925; US 7057146 B2 20060606; CN 1286098 C 20061122; CN 1643584 A 20050720; EP 1489605 A1 20041222; JP 2003281749 A 20031003; KR 20040090967 A 20041027; TW 200306552 A 20031116; WO 03081582 A1 20031002

INPADOC legal status


2008-03-19 [18W] WITHDRAWN

- Effective date: 20080128

2004-12-22 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20040706

2004-12-22 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR

2004-12-22 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Countries: AL LT LV MK